The NPCs don't tell me anything useful. It would be trivial anyway, and the only person you would hear about it from is Ikora, and all she's doing now a days is assembling Toland's Journal. Maybe if we actually saw the journal he might know about them.

It just seems like it's been confirmed through grimoire that they're no more than fossils at this point, or very well preserved armor pieces. There may be a surprise twist where we have to fight one at the end of a raid, but ionno.

Go look at Warlock Fragment 2, Oh Reader Mine, and you'll see.

http://www.destinygamewiki.com/wiki/Ghost_Fragment:_Warlock_2_(Grimoire_Card) "It showed me how Crota killed a Guardian with a screaming knife hammered out of his own Ghost." ------ Ghost Fragment: Legends 3 The Great Ahamkara Hunt After great deliberation it was determined that the Ahamkara be made extinct. It was not an easy decision. Power had been obtained from the bargains, and the City needed power. Knowledge had been gleaned, and the Ahamkara knew answers to questions no one had known to ask. But the price was too high. And no edict or forbearance seemed to stop Guardians from seeking them out, driven by hope, or vengeance, or despair. The call had to be silenced. So the Great Hunt did its work. And thus the Ahamkara were made extinct, their call silenced, their solipsistic flatteries erased, their great design - if it ever existed - broken. Of this you can be assured, oh reader mine. ------- I'm not saying there will never be ahamkara in the game, but I will wager that they are definitely not in the current version.

Based on the last line in that grimoire, it makes it seem as though an ahamkara is saying this, convincing the reader that the race is extinct. ( in case you are unaware, ahamkara are dragons that could speak and liked to make bargains that could be better for the beast or the person who the deal was mad with.)